Overview
The Precision Electronic Design LS7000 is a point-level switch sensing card PCB engineered for precise electronic liquid and dry material detection. This Revision 5 unit integrates RF balanced impedance bridge technology for stable detection across wide temperature ranges. Unlike mechanical alternatives, the LS7000 features no moving parts, offering superior reliability for bin, silo, tank, and container applications. The sensing card operates at 125VAC and includes integrated calibration electronics housed in an explosion-proof design.
Key Features
- RF balanced impedance bridge circuit for temperature-stable detection
- On-board test switch and adjustable time delay (1/8 sec to 2 hrs) to prevent false switching
- No moving parts—superior alternative to rotating paddles and float switches
- 316 stainless steel probe with Teflon insulator and Viton O-ring seals
- Explosion-proof cast aluminum housing for hazardous environments
- Capable of detecting liquids, dry bulk materials, and liquid interfaces (immiscible liquids)
Technical Specifications
| Power Supply | 125VAC |
| Point Level Detection | 5 inches |
| Time Delay Range | Adjustable 1/8 second to 2 hours |
| Probe Material | 316 Stainless Steel (standard) |
| Probe Pressure Rating | 1500 psi @ 75°F |
| Insulator | Teflon (standard) |
| Seals | Viton O-rings |
| Enclosure | Cast aluminum, explosion-proof |
| Revision | Rev. 5 |
| Detection Method | RF balanced impedance bridge |
Typical Applications
The LS7000 level switch sensing card is ideal for:
- Liquid level detection in storage tanks, bins, and silos
- Dry bulk material monitoring in hoppers and containers
- Liquid interface detection between immiscible fluids (oil/water separation)
- Hazardous or explosive environments (explosion-proof rated)
- High-temperature and wide ambient temperature applications
- Equipment requiring minimal maintenance and no recalibration due to product buildup
Compatibility & Replacements
Compatible With
- 125VAC industrial control systems
- Programmable logic controllers (PLCs) with relay input modules
- Process control systems requiring point-level switch inputs
- Hazardous area rated electrical enclosures (Class I, Group D ratings available)
Replaces / Drop-In Replacement For
The LS7000 is designed as a direct replacement for mechanical level switches, rotating paddle sensors, and float-based level detection systems requiring 125VAC operation. Verify compatibility with your system integrator before ordering.
Works With
- Allen-Bradley PLCs with analog/relay input cards
- Siemens S7 systems (via 125VAC relay interfaces)
- Omron and Mitsubishi PLCs with relay input modules
- Standard industrial 125VAC control circuits and motor starters
- SCADA systems accepting discrete relay switch inputs
